linux/tools/perf/util/ui/helpline.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "../debug.h"
#include "helpline.h"
#include "ui.h"
#include "libslang.h"

void ui_helpline__pop(void)
{
}

char ui_helpline__current[512];

void ui_helpline__push(const char *msg)
{
	const size_t sz = sizeof(ui_helpline__current);

	SLsmg_gotorc(SLtt_Screen_Rows - 1, 0);
	SLsmg_set_color(0);
	SLsmg_write_nstring((char *)msg, SLtt_Screen_Cols);
	SLsmg_refresh();
	strncpy(ui_helpline__current, msg, sz)[sz - 1] = '\0';
}

void ui_helpline__vpush(const char *fmt, va_list ap)
{
	char *s;

	if (vasprintf(&s, fmt, ap) < 0)
		vfprintf(stderr, fmt, ap);
	else {
		ui_helpline__push(s);
		free(s);
	}
}

void ui_helpline__fpush(const char *fmt, ...)
{
	va_list ap;

	va_start(ap, fmt);
	ui_helpline__vpush(fmt, ap);
	va_end(ap);
}

void ui_helpline__puts(const char *msg)
{
	ui_helpline__pop();
	ui_helpline__push(msg);
}

void ui_helpline__init(void)
{
	ui_helpline__puts(" ");
}

char ui_helpline__last_msg[1024];

int ui_helpline__show_help(const char *format, va_list ap)
{
	int ret;
	static int backlog;

	pthread_mutex_lock(&ui__lock);
	ret = vscnprintf(ui_helpline__last_msg + backlog,
			sizeof(ui_helpline__last_msg) - backlog, format, ap);
	backlog += ret;

	if (ui_helpline__last_msg[backlog - 1] == '\n') {
		ui_helpline__puts(ui_helpline__last_msg);
		SLsmg_refresh();
		backlog = 0;
	}
	pthread_mutex_unlock(&ui__lock);

	return ret;
}